Island



I. S. 8: G. N. BROWN.

SAW.

No 62,813. Patented Mar. 12, 1867.

Sod um gotten gurus gaunt gffigg,

IRA S. AND CHARLES 'N. BROWN, OF PROVIDENCE, RHODE ISLAND, ASSIGNORS TOTHEMSELVES AND MASON GROSS.

Letters Talent 1%. 62,813, dated March 12, 1867.

IMPROVEMENT IN SAWS.

TO ALL WHOM IT MAY CONCERN:

Be it known-that we, IRA S; and CHARLES N. BROWN, of Providence, in thecounty of Providence, and State of Rhode Island, have invented certainnew and useful Improvements ii -Saws; and we do hereby declare that thefollowing is a full and exact description of the same, reference beinghad to the accompanying drawing, which is a side elevation of a portionof a saw constructed according to our invention.

As all saws with removable-teeth lnivc heretofore been constructed, eachtooth has required to be fastened independently, and thus the expense ofthe first construction was much increased and the labor of removing theteeth for sharpening was great, while the liability of derangement wasin proportion to'the number of teeth. By our improvement but one lock orfasteningis required for a saw of any number of. teeth, and the teethare so supported that while that one lock is secure no tooth can beremoved; but by loosening the said lock the teeth may all be removed insuccession. The nature of our invention consists in the employment insaw teeth of a shank of hooking or equivalent form, whereby theresistance of-thc wood in sawingtends to force the said shank tighterinto its socket, in combination with the interlocking of one tooth uponanother in such a, manner that no tooth can be removed without firstremoving the adjacent tooth, whereby asingle look only is required forany desired number of tccth, which lock is applied to the last tooth inthe series, as shown in the drawings. A. is a saw plate, and B B B areteeth having shanks, b, of a hooking'or curred forin, fitting intoproperly prepared recesses in ,the'plate A, the edges ofthe shanks beinggrooved and the edges of the recesses sharpened in the usual manner toprevent lateral, displacement. This hook-formed shank bis so formed andsituaterelatively to the acting point of the tooth that any outward andbackward pressure upon the point tends to force the shank firmer intoitssockct. On the roar of each tooth is a projectiomb extending back onthe edge of the plate A to the next tooth, and on the front pfthe toothis a projection, b", which fits upon and o'verlapsthe'projcction b ofthe'preeeriing tooth, thereby preventing thc-remomlof any tooth untilthe next succeeding tooth is firstrcmored. As each tooth thus serves asa lock for the preceding tooth, when the last tooth in the series isfastened the whole series is locked and no one of them can be removed.We fasten the last tooth in the series in the followingmanner: A bolt,0, is fitted to slide upon the edge of the plate A, having guides, c, oneither side, and a piece, 0, riveted thereto and adapted to. slide in aslot in the plate'A, as shown. This arrangement is such that, while thebolt C can slide longitudinally upon the plateA, it cannot be removedtherefrom without destroying it. The cndot' the bolt 0 is a daptedtoflit upon thc projeetion b of the last tooth in the series and thushold it in place. A cam, D, is provided to operate the bolt 0 in a.Well-known manner. It will-be seen that the strain upon each tooth dueto the action of the tooth in-sawing isreceivcd upon its own shank, thesaid action tending to force the tooth Jinore firmly in place, but anytendency of the tooth. to become loosened is resisted by the overlappingpiece 12', of the succeeding tooth; and that any foicc exerted to removea tooth in coming upon the succeeding tooth acts in the same manner uponthe latter as does the resistance of the wood in sawing, viz, to forceit more firmly into its socket. Thusthe teeth are held in such a mannerthat while the last one of the series is securely locked no tooth in theseries can be removed, and all strains thereon only tend to confine themthe more firmly. v

llaving now fully described our invention, what We claim as new therein,and desire to secure by Letters Patent, is-

The combination of the curved shank b with projections b b,",'nnd meansfor locking or fastening the last tooth in the series, the wholeoperating together substantially in the manner and for the purpose aboveset forth.

IRA S. BROWN, CHAS.- N. BROWN.

Witnesses:

G. H. BABCOCK, J. A. CLARKE.

